package com.mmall.util;

import com.google.common.base.Preconditions;
import com.google.common.collect.Lists;
import com.google.common.collect.Maps;
import com.mmall.exception.ParamException;
import org.apache.commons.collections.MapUtils;

import javax.validation.ConstraintViolation;
import javax.validation.Validation;
import javax.validation.Validator;
import javax.validation.ValidatorFactory;
import java.util.*;

/**
 * 校验工具
 * Created by megan on 2018/1/21.
 */
public class BeanValidator {
    private static ValidatorFactory validatorFactory = Validation.buildDefaultValidatorFactory();

    public static <T> Map<String,String> validate(T t, Class... groups){
        Validator validator = validatorFactory.getValidator();
        Set validateResult = validator.validate(t,groups);
        if(validateResult.isEmpty()){
            return Collections.emptyMap();
        }else{
            LinkedHashMap errors = Maps.newLinkedHashMap();
            Iterator iterator = validateResult.iterator();
            while (iterator.hasNext()){
                ConstraintViolation violation = (ConstraintViolation)iterator.next();
                errors.put(violation.getPropertyPath().toString(),violation.getMessage());
            }
            return  errors;
        }

    }

    public static Map<String,String> validateList(Collection<?> collection){
        Preconditions.checkNotNull(collection);
        Iterator iterator = collection.iterator();
        Map errors;
        do {
            if(!iterator.hasNext()){
                return  Collections.emptyMap();
            }
            Object object = iterator.next();
            errors = validate(object, new Class[0]);
        }while (errors.isEmpty());
        return  errors;
    }

    public static Map<String,String> validateObject(Object first,Object... objects){
        if(objects !=null && objects.length > 0){
            return validateList(Lists.asList(first,objects));
        }else{
            return validate(first, new Class[0]);
        }
    }

    public static void check(Object paeam) throws ParamException{
        Map<String,String> map = BeanValidator.validateObject(paeam);
        if(MapUtils.isNotEmpty(map)){
            throw  new ParamException(map.toString());
        }
    }
}
